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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Calculation Of Basic And Diluted Earnings Per Share

The calculations of basic and diluted earnings per share for 2015, 2014 and 2013 are:



		For the Year Ended December 31, 2015
		Net income attributable to SEI (Numerator)				Shares (Denominator)			Per-Share Amount
Basic earnings per common share		$	331,655			165,725,000			$	2.00
Dilutive effect of stock options		—				3,873,000
Diluted earnings per common share		$	331,655			169,598,000			$	1.96



		For the Year Ended December 31, 2014
		Net income attributable to SEI (Numerator)				Shares (Denominator)			Per-Share Amount
Basic earnings per common share		$	318,713			168,246,000			$	1.89
Dilutive effect of stock options		—				4,319,000
Diluted earnings per common share		$	318,713			172,565,000			$	1.85



		For the Year Ended December 31, 2013
		Net income attributable to SEI (Numerator)				Shares (Denominator)			Per-Share Amount
Basic earnings per common share		$	288,124			171,561,000			$	1.68
Dilutive effect of stock options		—				4,157,000
Diluted earnings per common share		$	288,124			175,718,000			$	1.64